Non-Defined Subdomains

Try iptables

If the entry is not in the DNS, it should not get a reply.

Block Invalid

iptables -A -p tcp -d test.domain.com --dport 80 -j DROP

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Forwarding to another domain

iptables -t nat -A PREROUTING -d test.domain -p tcp --dport 80 -j DNAT --to domain.com

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A follow up question is which is better from an SEO point of view?

Is it better to make all the sites with broken links that point to my domain still function if someone clicks on the link or Google comes in off that link... by having them redirect to the domain.com version.

Basically..

badtext.domain.com/page/page.php = .domain.com/page/page.php

Is that more of a URL rewrite... issue or should i just make anything that does not point to the right domain not work..